Lister



Aug- 31, 1943 w. H. SILVERA 2,328,174

ATTO NEYS.4

Aug. 31, 1943. w. H. SILVER LISTER 5 Sheets-Sheet 2 Filed Sept. 23, 1940Patented Aug. 31, 1943 aszai'u LISTER Walter H. Silver, Moline, Ill..assignor to Deere &

Company, Moline, Ill.,

nois

a corporation of lili-'- Application September 23, 1940, Serial No.3579885 29 Claims.

The present invention relates generally to agricultural machines and ismore particularly concerned with tractor mounted implements in which atool frame, such as a lister or bedder frame, is pivotally connected tothe tractor for v chine of this character'wherein forwardly ex tendingparts are secured to the tool frame and receive the independentlymovable operating units. One advantage of this construction is that theimplement and tractor are .relatively closely coupled, yet there is nointerference between the implement parts and the rear wheels or othertraction means of the tractor.

Another feature of the present invention is the provisionl of new andimproved means limiting the relative free vertical movement of theseveral operating units relative to the tool frame, and the provision ofmeans on the tractor for raising the tool frame and hence, also, all ofthe operating units out of their operating position. More specically, itis a feature of the present invention to prov'de planting attachmentsfor listers and bedders. i

'I'hese and'other objects and advantages of the present invention willbe apparent to those skilled in the art after a consideration of thefollowing detailed description of the preferred embodiments, taken inconjunction with the accompanying drawings.

In the. drawings:

Figure 1 is a top plan view of a machine in which the.principles of thepresent invention have b een embodied, illustrating the tool frame of alister or bedder equipped with four planting units floatingly connectedwith the rear transverse bar of the tool frame;

Figure 2 is a side view of the rear portion ofthe machine, showing inparticular the floating connections between the planting means and thetool frame;`

Figure 3 is a section taken generally along the line 3 3 of Figure 2;

Figure 4 shows the manner of connecting the lister or bedder frame withthe tractor; and

Figure 5 is a View similar to Figure 2, showing a modiiled view of thepresent invention in which the gauge wheels and adjusting leverstherefor .have been eliminated.

Referring now more particularly to Figures 1,

2 and 3. the machine chosen to illustrate this embodiment of the presentinvention comprises a tractor indicated in its entirety by the referencenumeral I. a tool frame 2 and a plurality 0f planting units 3. Thetractor is of well-known construction embodying frame means 5 and rearaxle extensions 6 in which axle shafts 1 are journaled. The latter carryrear traction means in the i'orm of wheels 8. The front end of thetract'or is supported in the usual manner by a dirigible front truck 9.The operators seat on the tractor is indicated at I2, and the tractor isprovided with power lift mechanism indicated at |3 to which moredetailed reference will be made later.

'I'he tool frame 2 is of the general construction shown in my priorPatent Re. 21,266, issued November 14, 1939. The tool frame 2 Iconsistsof generally forwardly extending frame bars 2| which may converge towardtheir forward ends and are pivotally connected through suitable hitchmeans I5 to the forward portion of the tractor. Such hitch means may bespring cushioned or longitudinally adjustable as shown in Figure 4 andin my-prior patent. The rear ends of the frame bars 2| are bolted toplates 22 that are secured, asby welding 23, to a transverse tool framesection 24, preferably in the form of a square bar which extendslaterally of the tractor beyond the rear traction wheels 8, as bestshown in Figure 1. The frame bars 2| are connected together adjacenttheir rear ends by a brace member 26 which carries a slotted plate 21suitably xed to the central portion thereof. The slot in the plate 21receives the rear end 28 oi.' a Y-shaped member 29, the forward ends ofwhich are pivoted to the rear portion of the tractor in any suitableway, as being pivoted to brackets 3| and 32 which are bolted to theunder side of the rear axle housing. The frame 2 is thus connected forgenerally vertical swinging movement relative to the tractor, butlateral movement of the frame 2 is restrained by the member 29.

The frame 2 is raised and lowered by suitable connections with thetractor power lift I3. The latter includes a transversely disposed rockshaft 36 which extends laterally outwardly of the sleeve sections 3i and38 of the power lift casing. A lifting arm 4| is fixed to each end ofthe power lift rock shaft 36 and has pivoted thereto an arm extension 42that extends rearwardly to a point substantially directly over thetransverse brace member 26. A link 44 extends downwardly from the outerend of each of the arms 42 to the brace member 26 so that the frame 2will be raised when the rock shaft 36 is actuated in one direction. Theconnections between Athe arms 4| and the arm extensions 42 are such thatthe latter may swing freely upwardly `relative to the arms 4|. Ineffect, as will be readily understood, this provides a floatingconnection between the frame 2 and the tractor l when the arms 4| on thevpower lift rock shaft 36 are rocked downwardly, but when the arms 4|are swung upwardly, the outer ends ofthe latter engage underneath thearm extensions 42, serving thereby to raise the latter and the tool orimplement frame 21 connected therewith.

When used as a lister, middlebreaker or bedder, one or more -beams 50,'preferably of vcast steel, are xed in a proper lateral position to thetransverse bar 24. To this end, the upper end 5| of the beam 50 isformed with a V-shaped socket and is apertured to receiveA clampingbolts 52 by which a cap 53, which also has a V-shaped socket, is clampedagainst the forward side of the bar 24. As best shown in Figure 2, eachbeam 50 curves downwardly and rearwardly and at its lower end isapertured to receive the standards by which a conventional lister bottomor sweep is normally connected to the standard 50. Generally, there isan opening in the lowermost portion of each standard 50 and a series ofseveral openings, indicated in Figure 2 by the reference numeral 54,above the lower opening. A rearwardly extending lug755 is formed on eachbeam 50 to receive the seed holding and selecting mechanism to whichreference will be :made below.

The position of the implement frame 2 relative to the ground iscontrolled by a pair of gauge wheels 60. Each gauge wheel is mounted ona vertically swingable crank axle 6|, the rear or ioumal portion 62 ofwhich is received in a` suitable bearing sleeve at the lower end of abracket casting `63 which is clamped to the bar 24 by a cap 64 and bolts65. The clamping bolts 65 also serve to support an angle bracket 66 inwhich a shaft 61 is supported for rocking movement..

An arm l68 is fixed to the outer end of each shaft and is connectedthrough a link 69 (Figure 1) to the vgauge wheel supporting axle end ofthe crank axle 6|. The inner end of each of the shafts 61 is supportedfor rocking movement in a bracket xed to the rear end of the associatedframe bar 2l, and to the inner end of each of the shafts' 61 is ilxeda-hand lever 1|'having ratchet mechanism 12 cooperating with a sector 13,also connected tothe associated frame bar 2|. By loosening the clampingmeans '64, the gauge wheel 60 and associated `parts may be moved todifferent' adjusted positions along the square bar 24.v

4The construction described above, when lister bottoms or other listingtools are xed to the lower ends of the'beams 50, forms a lister, bedderor middlebreaker, and I do not in this application claim the particularfeatures per se of the implement frame or gauge wheels, since such areincluded in the features disclosed and claimed in my prior patentmentioned above. According to the present invention, I make use of thetool frame of a lister, including the lister bottom supporting beams,4to provide improved planting means in the nature of attachmentsfor alister 1 connected to each of the lister bottom supporting` 75 Y beams50. Preferably, each planting attachment consists of a runner 8|, whichwhen drawn` through the soil forms aseed receiving furrow, a runnershank 82 which is hollow and receives the seed to be planted, and a pairof gauge shoes 83 and 84 (Figure 3). Bolted, as at` 85, to oppositesides of each runner 80, is a pair of angles 81 which extend generallyforwardly and upwardly from the front portion of the associated runner8|. The upper vertical sections of the angles 81 are apertured toreceive three pivot bolts 88 (Figure 2). The lower horizontal flanges ofthe angles 81 are apertured to receive bolts 89 -by which the left andright hand gauge shoes 83 and 84 are fixed in position.

Mounted on the upper pivot bolt 88 of `each.

of the planter units 80', is a pair of straps 92 forming the upper of apair of parallel links connecting the anglesr81 to the beam 50. Theupper pair of straps 92 are apertured at their rear end and receive apivot bolt 93 which is disposed in one of the openings 54 in theassociated frame beam v51|. -A lower pair of straps 95, which may be ofsubstantially identical conl struction to the straps 92, are pivoted attheir forward ,ends on the lower bolt 88 and at their rear ends areapertured to receive a pivot bolt 96 disposed in the lower apertured endof the associated lister bottom beam 50. The pairs of straps 92 and 95thus form a pair of generally parallel links connecting the runner 80for relatively free vertical floating movement with respect to thebeam`50. The links 92 and 95 thus form draft transmitting parts whichnot only accommodate the aforesaid floating movement, but also cause theassociated runner 80 to be drawn through the soil during the forwardtravel of the machine.

A pair of relatively long straps and |02 (Figure 2) are pivoted at theirforwardends on the intermediate bolt 88 and extend in spaced apartrelation on opposite sides but in sliding` contact with the lowerportion on the lister bottom beams 50, rearwardly of which the straps|0| and 02 are 'bolted as at |03 to the runner shank 82. The links orstraps |0| and |02 extend rearwardly beyond the runner shank 82 and arebent so as to be spaced apart at their rear ends (Figure 3) and toreceive a pair of press wheels |06 journaled for rotation between thespaced apart ends upon an axle |01. The straps or links |0| and |02 thusserve as a frame which forms a part of the runner unit 80 and whichextends rearwardly to support the press wheels |06 in the properposition relative to the runner 8|. The frame I0|, |02 also serves tosupport a pair of knife coverers ||0 and i l which are pivoted,respectively, to brackets |I3 and ||4 and held in proper position by apair of links |`|6 and springs H1. A bolt |I8 with a suitable spacer(not shown) connects the two straps l0| and |02 just rearwardly of thebeam 50 so as to maintain the portions of the straps I 0I and |02 inproper position for guiding the movement of the runner unit 80 relativeto the beam 50, as permitted by the parallel links 92 and 95.

. A spring |20 is connected at its lower end to a bolt H9 whichis'carried adjacent the rear end of the` lower link 95. The upper end ofthe spring |20 is connected to a link |2| adjustably secured in a sleeve|22 which is pivoted, as at |23, to the upper links 92. A nut |24 isthreaded onto the upper end of the link |2| so as to provide foradjusting the tension of the spring |20, the effect of` which is to urgethe runner unit 80 downwardly'into furrow opening position. The gaugetion relative to the runner 8|.

shoes 83 and 84 limit the amount of penetration under the influence ofthe spring |20 and the action of gravity. The runner 8| is provided witha plurality of holes |28 so that the bolts 85 may be disposed at variouspositions to adjust the amount of penetration. While the spring |20normally exerts sumcient force to hold the run- Iner in the ground. ifthe runner should encounter an obstruction the spring |20 yields topermit the unit 80 to move upwardly. During this movement. the unit 80moves generally parallel to itself, by virtue of the parallel links 92,95, the straps and |02 sliding on opposite sides of the beam 50 and,being bolted at |03 to the runner shank 82, the links |0| and |02 holdthe press wheels |06 at all times in the proper posi- Also. as shown inFigure 3, the straps |0| are disposed generally in the planes of thepivoted upper and lower links 92 and 95, whereby by engaging the links,the straps- 0| serve as stops orlost motion means limiting the verticalfloating movement of th runner 8|.

The seed holding and selecting mechanism is indicated in its entirety bythe reference numeral |30 and comprises a seed can|3| carried on a base|32 which includes a conventional seed selecting mechanism. The seedselected is discharged through a seed tube |34 into the hollow runnershank 82. The seed selecting mechanism is driven by a shaft |36 which,as best shown in Figure 1, extends from the outermost operating unit atone side of the tractor to the innermost unit at that side. In a fourrow machine there are, of course, two units on each side -of thetractor, the two units at each side being driven through suitableconnections with the gauge wheel 60 at that side. As best shown inFigure 2, the driving connections for the seeding shaft |36 consists ofa sprocket and chain unit `|40 driven from the gauge wheel |60 `andwhichincludes a double sprocket unit |4| mounted for rotationcoincidental with the axis of pivotal connection between the arm 68 andthe link 69. A double sprocket |4| is connected by a sprocket chain |42to a second double sprocket |43, and the latter is connected by asprocket chain |44 to a sprocket on the shaft |36, as best shown inFigure 1. Thus, movement of the lever 1| to dispose the gaugewheel 60 inVarious positions relative to the implement frame does not aiect thedriving connection between the gauge wheel and the seed selecting shaft|36. 'I'he seed can and base |3| is supported by a pair of bolts |46extending through a lug |41 carried by the base |32, 'the bolts |46passing through apertures in the lug 55 on the beam 50. The base |32supports the seedbar 24 so as to dispose the planting units 80 closer tothe tractor. Since the gauge wheels 60 have been omitted, the implementframe 2 is supported bar. 24. Preferably, each of the brackets |60consists of a strap member |6| disposed vertically and forked at itslower end to receive a V-shaped bolt |63 which clamps the lower end ofthe strap |6| in'place. At the upper end of the strap |6| is ahorizontal member |62 upon which the seed can |3|a is fixed. In thisform of the invention the seeding units are slightly different from theseeding units |30 shown in Figure 2. `In Figure 5 the seed cans |3|a areof the side delivery, or sight feed, type and include seed selectingmechanism connected `to be driven by the seeding shaft` |36a. The seedselected is ejected through a spout |64 which discharges into a seedtube |65, the lower end of which enters the seed boot or shank 62. Itwill be noted that when the lister beam Shanks 50 are reversed, as inFigure 5, so as to be disposed in a forward position, the fory wardlyextending links 92 and 95 support the by the tractor and the drive forthe seeding shaft angle member 81 in a position alongside thereartractor wheel 8, generally in about the same position, so far as theouter units are concerned, as the gauge wheel 60, shown in Figures 1 and2. It will be seen that this construction provides a compact and closelycoupled outfit.

In view of the fact that in Figure 5 the gauge wheels 60 have beenomitted, it becomes necessary to support the implement frame 2 from thetractor, both when the tools are raised and when they are in operatingposition. In Figure 5 the implement frame is supported by virtue of theconnections 44 to the lifting arms 42, the connections being arranged,as indicated in Figure 5, so that when the power lift is lowered theweight of the frame 2 is sustained bythe power lift mechanism I3. It isnot necessary, however, to have the power lift of the tractor supportthe weight of the various planting units 80, for these units, beingarranged as shown in Figure 2, are floatingly connected by the parallellinks 92 and 95 so that the weight of the units is supported upon thegauge shoes 83 and 84. In this form of the invention, as in Figure 2,the engagement of the straps with the links 92 and 95 serves as stops orlost motion means limiting the vertical floating movement of the planterfurrow openers. In Figure 5 the Weight of the implement frame and theseed cans is supported on the tractor.

In Figures 1 and 2 the seeding mechanisms of the several unitsv aredriven from the gauge wheels 60, but in the form of the invention shownin Figure 5 in which the gauge wheels have been omitted, the seedingmechanisms are arranged to be driven from the rear tractor wheels 8. Thedriving mechanism shown in Figure 5 is substantially the same as thedriving mechanism disclosed and claimed in my co-pending applicationvmentioned above. Since the details of the driving mechanism are claimedin another application, n0 claims to the driving mechanism per se aremade in this application. Briey, the driving mechanism for the formshown in Figure 5 comprises a driving sprocket |10 fixed to each axle 1inside the associated rear wheel 8, each sprocket 10 being of thetwo-part separable type to facilitate connecting and disconnecting thesame from the; associated driving axle. A sprocket chain 1| .is trainedabout the driving sprocket' |10 and`xtends rearwardly where it passesaround a sprocket pinion mounted` on a shaft that carriesl a gear thatmeshes with an intermediate gear which, in turn, meshes with a gear thatdrives the seeding shaft |36a, as disclosed in said co-pendingapplication. Provision is made for adjusting the effective length of thechain I 1| so that when the frame 2 is raised and lowered the chain lllis shortened or lengthened by a corresponding amount. Agspring serves to'-keep the chain tight at all times and takes care vof irregularities`during operation. It will be understood that there is; aA driving chainIll and associated driving and ad justing connections at each side ofthe tractor so that each seeding shaft |3612, which corre- /sponds tothe seeding shaft |36 shown in Figure il, has its ownv drive. Ifdesired, however. by C connecting the two seeding shaft sections onlyone driving connection is necessary. However, I prefer to drive eachseeding shaft section from its associated rear tractor wheel.

While I have shown and described above'theV preferred forms in which theprinciples of the present invention have been incorporated, it is to beunderstood that my invention is not 'to be limited to the particulardetails shown and described above, but that, in fact, widely differentmeans may be employed in the practice of the broader aspects of myinvention.

What I claim, therefore, and desire to secure ally rearwardly of saidtransverse bar, brackets fixed to said transverse bar, a plurality ofvfurrow opening means, sets of generally parallel links connected attheir rear ends to said brackets and extending generally forwardlytherefrom and connected to the forward lportion of said furrow openingmeans so as todispose the reary a portion of the latter in a position toreceive seed from said mechanism. l

2. A planter attachment for a tractoncomprising a transverse member, abracket carried by said member, a pair of spaced approximately parallellinks extending generally forwardly from said bracket, a memberconnecting the forwardA ends of said links, and planting means carriedby said transverse member.

3. A multi-row planter comprising a tractor having rear wheels, animplement frameconnected with said tractor for relative floatingmovement, a pair of gauge wheels extending forwardly and disposed at thelaterally outer sides of said rear wheels for said tractor, a pluralityof planting units, andmeans including generally Acontainer and includinga draft part disposed ahead of said lister beam, and link meansextending forwardly from said lister beam to said draft part foriioatingly connecting said seed furrow opener with the associated listerbeam.

6. A tractor propelled implement comprisinga lister frame includinggenerally forwardly extending frame members adapted to be pivotallyconnected with the tractor, a transverse tool bar at the rear ends ofsaid forwardly extending frame members, a plurality of generallydownwardly extending lister beams connected with said transverse toolbar, a plurality of planting umts, each including a seed containercarried by said frame, a seed furrow opener arranged to receive seedfrom said container, and link -means iloatingly connecting said seedfurrow opener with the associated lister beam, each of said lister beamscurving generally downwardly and rear-k wardly with respect to the toolbar to which they are connected and `said link means extending ygenerally forwardly from the lower ends of said lister beams,` and gaugewheels movably4 connected with said lister frame.

'7.` A tractor propelled implement comprising a lister frame includinggenerally forwardly extending frame members adapted to be pivotallyconnected with the tractor, a transverse tool bar at they rear ends ofAsaid forwardly extending frame members, a plurality of generallydownwardly extending lister beams connected with said transverse toolbar, a'plurality of planting units, each including a seed containercarried by said frame, a seed furrow opener arranged to receive seedfrom said container, and link means oatingly connecting said seed furrowopener with the associated lister beam, and means for supporting therear end of the frame on the tractor and said lister beams extendinggenerally cluding a transverse tool bar at the rear of the forwardlyextending links connected at their rear l ends with said implement frameand at their forward ends with said units for 'oatingly conneet-ing thelatter with said implement frame.

4. A multi-row planter comprising a tractor,x

for driving ,said seeding mechanism from at leastv one 0f said gaugewheels.

5. An agricultural implement comprising the l combination with atractor, of a lister frame includingv generally forwardly extendingframe members pivotally connected with the tractor,

` downwardly and forwardly with respect to the tool bar to which theyare connected, and said link means extending generally forwardly from fthe lower ends of said lister beams.

8. The combination with a bedder frame adapted to be connected with atractor and intractor and depending tool shanks adapted to be 'securedto said tool bar with the lower end either forward or rearward of thetool bar and vextending generally downwardly therefrom, of seed holdingand selecting mechanism, bracket means separate from said toolshanks forsupporting said mechanism on therear end of said bedder frame, groundengaging seed furrow opening means, and means floatingly connecting saidfurrow opening means with said depending tool Y shanks.-

9. The vcombination with` a bedder frame adapted to be connected' with atractor and including a transverse tool bar at the rear of the tractorand depending tool shanks secured to said tool bar and extendinggenerally downwardly therefrom, of seed holding and selecting mechanism,means connecting said mechanism -witli said tool bar substantially abovesaid tool shanks,

ground engaging seed furrow opening means ex-y tending generallylongitudinally and forwardly of said tool Shanks substantiallyunderneath said :,saaru seed holding and selecting mechanism, andforwardly extending link means connected at the rear end to saiddepending tool shanks, and at the forward end to said furrow openingmeans for iloatingly connecting said furrow opening means with saiddepending tool shanks.

l0. An agricultural implement comprising the combination with a tractor,of a lister frame including generally forwardly extending frame memberspivotally connected with the tractor, a transverse tool bar at the rearends of said longitudinally extending frame bars, a plurality ofbrackets fixed to said tool bar, a plurality of ground engaging units, apair of generally vertically spaced links floatingly connecting eachunit with thevassociated bracket, and means including a part disposedbetween the links of each pair to be engaged by the links for limitingthe movement of each unit relative to the tool bar.

l1. An agricultural implement comprising a supporting frame having adepending bracket, a.

ground engaging unit rhaving an upstanding portion at its forward end,and a pair of spaced approximately parallel links extending generallyforwardly from said bracket and connected with said upstanding portionfor floatingly connecting said unit with said frame.

12. An agricultural implement comprising a supporting frame having adepending bracket, a ground engaging unit having an upstanding portionat its forward end, a pair of spaced approximately parallel linksextending generally forwardly from said bracket and connected with saidupstanding portion for floatingly connecting said unit with said frame,and a part fixed against movement relative to said unit and engageablewith at least one of said links for limiting the movement of said unitrelative to said frame.

13. A planting unit comprising a furrow open- Aer having a seed boot, anupstanding part fixed to the forward portion of said furrow opener, apress wheel frame fixed to said seed boot and to said upstanding part;and a pair of attaching links pivoted to said upstanding part andextending generally rearwardly alongside said press wheel frame.

14. A planter comprising a supporting frame having a generallyvertically disposed bracket,

a seed furrow opener having an upstanding portion flxedto the forwardportion of said furrow opener, a press wheel frame fixed to said furrowopener and including laterally spaced parts on opposite sides of saidbracket, and a pair of attachinglinks pivoted to said upstanding portionat their forward ends and to said bracket at their rear ends. l

15. A planter comprising a supporting frame having a generallyvertically disposed bracket, a seed furrow opener having an upstandingportion iixed to the forward portion of said furrow opener, the latterhaving a seed boot, a press wheel frame comprising a pair of laterallyspaced apart members disposed on opposite sides of said bracket andfixed to opposite sides of said seed boot and to the upstanding portionof said furrow opener, and a pair of attaching links pivoted to saidupstanding portion and to said bracket.

16, A planting unit comprising a furrow opener having upstanding partsadjacent the front and rear portions thereof, a press wheel framesecured to both of said parts for movement with said furrow opener, anda pair of attaching links pivoted to the front upstanding part at pointsabove and below the press wheel frame.

17. A planting unit comprising a furrow opener having upstanding partsadjacent the front and rear portions thereof, a press wheel framesecured to both of said partsfor movement with said furrow opener, and apair of rearwardly extending links pivoted at their forward ends to thefront upstanding part at points above and below the press wheel frame.f/

18. A planter including a planting unit and a member with which saidunit is adapted to be connected, said unit comprising a seed furrowopener, a pair of vertically spacedlinks pivoted to a part of the furrowopener and adapted to be pivoted to said member, and a press wheel framefixed to said furrow opener in a position between said links wherebysaid press wheel frame serves to limit the swinging movement of saidlinks. i ,f

19. The combination with a bedder frame adapted to be connected with atractor andincluding a transverse tool bar at the rear of the tractorand depending tool shanks secured to said tool bar and extendinggenerally downwardly therefrom, of seed holding and selecting mechanism,means connecting said mechanism with said tool bar substantially abovesaid tool shanks, ground engaging seed furrow opening means extendinggenerally longitudinally and forwardly of said tool shanks substantiallyunderneath said seed holdin-g and selecting mechanism, a generallyupwardly extending bracket means secured to the forward end of saidlongitudinally extending furrow opening means, and forwardly extendinglink means connecting at the rear end to said depending tool shanks andat the forward end to Vsaid upwardly extending bracket means foriloatingly connecting said furrow opening means with said depending toolshanks.

20. 'I'he combination with a frame adapted to be `connected with atractor and including a transverse tool bar at the rear of the tractorand depending tool Shanks secured to said tool bar and extendinggenerally downwardly therefrom, of seed holding and selecting mechanism,means supporting said seed holding and selecting mechanism on said toolbar, ground engaging seed furrow opening means, link means floatinglyconnecting said furrow opening means with said dependingntool shanks,and means engageable with said linkimeaus for raising said seed furrowopening means. 21. An agricultural implement comprising a supportingframe having a depending bracket, a ground engaging unit having anupstanding portion at its forward end, a pair of spaced approximatelyparallel links extending generally forwardly from said bracket andconnected with said upstanding portion for fioatingly connecting saidunit with said frame, and means dis- I posed in a position to be engagedby at least one of said links for limiting the movement of said unitrelative to said bracket.

22.*An agricultural implement comprising a supporting frame having adepending bracket, a ground engaging unit having an upstanding portionat its forward end, a pair of spaced approximately parallel linksextending generally forwardly from said bracket and connected with saidupstanding portion for floatingly connecting said unit with said frame,and means carried on said upstanding portion in a position to be engagedby at least one of said links for limiting the movement of sa d unitrelative to said bracket.

23. An agricultural implement comprising a supporting frame having adepending bracket. a

A er having a seed boot, a press wheel frame fixed to said seed boot,and a pair of attaching links pivoted to said furrow opener andextending alongside said press wheel frame so as to be limited in itsmovement bythe latter.

25. A planting unit comprising bracket means, a furrow opener having aseed boot, a press of attaching links pivoted to said furrow opener andsaid bracket means and engageable with said press wheel frame forlimiting the movement of er, bracket means with-which said'furrow openeris movably connected, a press wheel frame coniting means cooperatingwith said press wheel frame for limiting the movement of said furrowopener relative to said bracket means.

27. A planter comprising a supporting frame having a generallyvertically disposed bracket, a seed furrow opener movably connected withsaid bracket, a press wheel frame -ilxed to said furrow opener, andmeans acting between said press wheel and said bracket for limiting themove-4 ment of said furrow opener relative thereto.

28. A planter comprising a supporting frame having agenerally/vertically disposed bracket. a seed furrow opener, apresswheel 'frame fixed to said furrow. opener and ,including laterallyspaced parts on opposite sides of said bracket,

and meansxmovably connecting said furrow opener with saidbracket.'relative movement between said furrow opener and said bracketbeing guided by said laterally 'spaced parts of the wheel frame fixed tosaid seed boot, and a npair 20 nected with said furrow opener, andmotion limpress wheel frame.

29. A planter attachment for a tractor, comprising a transverse member,a bracket carried by said member, a pair of spaced approximatelyparallel links extending generally forwardly from said bracket, a memberconnecting the forward ends of said links, and planting means carried bysaid last mentioned connecting member.

' WALTER I-I. SILVER

